Why are the renderlayers rendering black?
This is because the Scene layers corresponding to your renderlayers are not enabled:



If you enable the right scene layers (or all of them), then it works as expected.

Note that by default the 3D view layers are linked to the scene layers. You may want to turn this off by toggling Lock Camera and Layers in 3D view > Header:





Also note that there is nothing on the Lines renderlayer; perhaps you meant to select this layer instead?